1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Julli [10]
3 years ago
12

Briefly describe a bird heart and circulatory system

Biology
1 answer:
Arlecino [84]3 years ago
5 0
<span>The avian heart has evolved into a large and powerful organ with rapid muscular contractions. Generally the smaller the species the larger the relative heart size. Generally birds have hearts larger and ones that beat faster than mammals. The human heart weight amounts to .42 percent of body weight and the pulse rate at rest averages 72 beats per minute. The House Sparrow's heart constitutes 1.68 percent of the body weight and the pulse rate at rest averages 460 beats per minute. In the Ruby-throated Hummingbird these figures rise to 2.37 percent and a pulse rate of 615.</span>
You might be interested in
An industrial society would MOST LIKELY use minerals to make
Aleks [24]

Answer:

D) products, such as cans and glass bottles

Explanation:

Minerals are naturally occurring inorganic solid substances that have more or less chemical composition and characteristic physical properties. Minerals are used for many purposes. Minerals (such as aluminum and boron) are used by industries to produce products such as cans and glass bottles. Minerals are also used in the construction/ building of houses and other buildings. Limestone, shale and gypsum are used to produce cement. Minerals such as diamond, pearls, and ruby are also used to make jewelry such as rings but an industrial society would MOST LIKELY use minerals to make products such as cans.

4 0
3 years ago
For energy, there is a one-way flow through an ecosystem, while matter is ________.
umka21 [38]

Answer:

constant is the answer

7 0
3 years ago
Which two sentences identify the characteristics of a prokaryote?
Mrac [35]

Answer:

Most prokaryotes lack well defined organelles.

Explanation:

Prokaryotes are the unicellular organisms which have no true nucleus while eukaryotes have true nucleus. True nucleus means that the membrane is present around the nucleus and other organelles. Many organelles are also absent in prokaryotic cell such as mitochondria, cell wall, golgi bodies, endoplasmic reticulum, lysosomes, ribosome and vacuole.

6 0
3 years ago
Which genetic or chromosomal abnormality below is correctly matched with its description?
Bogdan [553]
It seems that you have missed the necessary options for us to answer this question so I had to look for it. Anyway, here is the answer. The genetic or chromosomal abnormality that is correctly matched with its description is this: Phenylketonuria—the child cannot produce a critical enzyme, resulting in an accumulation of <span>poison, in turn causing mental disorder. Hope this helps.</span>
7 0
3 years ago
Exposing tissues to extreme cold in order to destroy tissues is called ________
Alex777 [14]

Answer:

Cryosurgery

Explanation:

With the help of cryosurgery the abnormal tissues & tumors are demolished . This surgery is done with the help of of liquid Nitrogen , often used Carbon dioxide and Argon gas too .

7 0
3 years ago
Other questions:
  • Cancer occurs when cell division becomes uncontrolled. What is one factor that can cause the cell cycle to lose control
    9·1 answer
  • ​Researchers believe that the size difference between male and female brains results from the influence of: a. ​gender identity.
    8·1 answer
  • Explain how the nervous system helps the muscular system control heart rete, digestion, and respiration
    7·1 answer
  • A closed circuit occurs when
    5·1 answer
  • The subunits of a cell function independently. True or False?
    15·2 answers
  • Can you help me out with this one plz
    5·1 answer
  • SOMEONE PLZ HELP ME WITH THIS?!?!?
    11·2 answers
  • How does a steam engine do work?​
    11·2 answers
  • On Earth, water is found naturally in all of these states EIXCEPT_.*
    15·2 answers
  • What will be the pulse rate if you meet a black bear in the forest
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!